We're dividing 399675 by 87 
We want to divide 399675 by 87.

Moving on to step 1:
87 can be fit into 3 0 times, resulting in a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 87

Let's proceed to step 2:
If we divide 39 by 87, we get 0 and a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Grab the next digit (9) from the dividend, add it to 39, then carry on: 399 / 87

Step 3:
If we divide 399 by 87, we get 4 and a remainder of 51.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 348 from 399 to get 51.
Include the next digit (6) from the dividend after 51, then repeat: 516 / 87

Let's proceed to step 4:
The number 87 fits into 516 5 times, leaving a remainder of 81.
Use 5 as the next digit of our solution. 
Result so far: 45.0
Subtracting 435 from 516 leaves us with 81.
Take the next digit (7) from the dividend and append it to 81, then repeat: 817 / 87

Let's proceed to step 5:
When dividing 817 by 87, we get 9 with a remainder of 34.
Write down 9 as next digit of the result. 
Result so far: 459.0
If we take 783 away from 817, we end up with 34.
Fetch the next digit (5) from the dividend, attach it to 34 and continue: 345 / 87

Let's proceed to step 6:
If we divide 345 by 87, we get 3 and a remainder of 84.
Use 3 as the next digit of our solution. 
Result so far: 4593.0
Subtract 261 from 345 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Let's proceed to step 7:
840 divided by 87 is 9 with a remainder of 57.
Put 9 as the next digit of the answer. 
Result so far: 4593.9
Deduct 783 from 840 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 8:
570 divided by 87 is 6 with a remainder of 48.
The number 6 becomes the next digit in our result. 
Result so far: 4593.96
Deduct 522 from 570 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 9:
480 divided by 87 is 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 4593.965
The remainder is 45 after subtracting 435 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Let's proceed to step 10:
87 can be fit into 450 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 4593.9655
Subtracting 435 from 450 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 4593.9655 with a remainder of 0.00015.